Jacob Walch was the captain of the starliner Prospector, which he inherited from his father. He was born on Seti Alpha III, and was a good friend of Helena and Sergey Rozhenko, who helped him meet his future wife, Miriah. His youner brother, Benjamin, was killed on the USS Crockett. When he learned that Mon Hartog had tried to destroy his ship, Jacob tried to strangle Hartog. He was cleared of any wrongdoing because at the time he was under the influence of the Sli. (TNG novel: Sins of Commission)